I. Ajzen, From intentions to actions: A theory of planned behavior Action-control: From cognition to behavior, p.39, 1985.

P. B. Andersen, C. Emmeche, and N. Finnemann, Downward Causation: Minds, bodies and matter, 2000.

M. Arnold, On the phenomenology of technology: the ???Janus-faces??? of mobile phones, Information and Organization, vol.13, issue.4, pp.231-256, 2003.
DOI : 10.1016/S1471-7727(03)00013-7

P. Attewell, Technology Diffusion and Organizational Learning: The Case of Business Computing, Organization Science, vol.3, issue.1, pp.1-19, 1991.
DOI : 10.1287/orsc.3.1.1

M. Avital and D. Te-'eni, From generative fit to generative capacity: exploring an emerging dimension of information systems design and task performance, Information Systems Journal, vol.30, issue.1, pp.345-367, 2009.
DOI : 10.1111/j.1365-2575.2007.00291.x

R. P. Bagozzi, The legacy of the technology acceptance model and a proposal for a paradigm shift, Journal of the Association for Information Systems, vol.8, issue.4, pp.244-254, 2007.

H. Bala and V. Venkatesh, Assimilation of Interorganizational Business Process Standards, Information Systems Research, vol.18, issue.3, p.340, 2007.
DOI : 10.1287/isre.1070.0134

N. K. Baym, Socially Mediated Publicness: An Introduction, Journal of Broadcasting & Electronic Media, vol.16, issue.12, pp.3-2012
DOI : 10.1111/j.1468-2958.2007.00312.x

URL : http://apo.org.au/node/33288

I. Benbasat and H. Barki, Quo vadis, TAM, Journal of the Association for Information Systems, vol.8, issue.4, pp.211-218, 2007.

A. Bhattacherjee, Understanding Information Systems Continuance: An Expectation-Confirmation Model, MIS Quarterly, vol.25, issue.3, pp.351-370, 2001.
DOI : 10.2307/3250921

URL : http://elibrary.aisnet.org/Default.aspx?url=http://aisel.aisnet.org/cgi/viewcontent.cgi?article=2617&context=misq

D. M. Boyd, None of this is Real: Identity and Participation in Friendster in: Structures of Participation in Digital Culture, Social Science Research Council, 2007.

F. Davis, Perceived Usefulness, Perceived Ease of Use, and User Acceptance of Information Technology, MIS Quarterly, vol.13, issue.3, pp.319-340, 1989.
DOI : 10.2307/249008

F. D. Davis, R. P. Bagozzi, and P. Warshaw, User Acceptance of Computer Technology: A Comparison of Two Theoretical Models, Management Science, vol.35, issue.8, pp.982-1003, 1989.
DOI : 10.1287/mnsc.35.8.982

M. T. Dishaw and D. M. Strong, Extending the technology acceptance model with task???technology fit constructs, Information & Management, vol.36, issue.1, pp.9-21, 1999.
DOI : 10.1016/S0378-7206(98)00101-3

S. Dutta, What's Your Personal Social Media Strategy?, Harvard Business Review, vol.88, issue.11, pp.127-130, 2010.

M. Fishbein and I. Ajzen, Belief, attitude, intention, and behavior: An introduction to theory and research, 1975.

D. Gefen and D. W. Straub, Gender Differences in the Perception and Use of E-Mail: An Extension to the Technology Acceptance Model, MIS Quarterly, vol.21, issue.4, pp.389-400, 1997.
DOI : 10.2307/249720

M. S. Granovetter, The Strength of Weak Ties, American Journal of Sociology, vol.78, issue.6, pp.1360-1380, 1973.
DOI : 10.1086/225469

R. Hanna, A. Rohm, C. , and V. L. , We???re all connected: The power of the social media ecosystem, Business Horizons, vol.54, issue.3, pp.265-273, 2011.
DOI : 10.1016/j.bushor.2011.01.007

A. Hester, Innovating with organizational wikis, Proceedings of the 2008 ACM SIGMIS CPR conference on Computer personnel doctoral consortium and research , SIGMIS-CPR '08, pp.161-163, 2008.
DOI : 10.1145/1355238.1355278

A. J. Hester and J. E. Scott, A Conceptual Model of Wiki Technology Diffusion, Proceedings of the 41st Annual Hawaii International Conference on System Sciences (HICSS 2008), p.32, 2008.
DOI : 10.1109/HICSS.2008.10

C. L. Hsu, L. , and H. P. , Why do people play on-line games? An extended TAM with social influences and flow experience, Information & Management, vol.41, issue.7, pp.853-868, 2004.
DOI : 10.1016/j.im.2003.08.014

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.505.6970

C. L. Iacovou, I. Benbasat, and A. S. Dexter, Electronic Data Interchange and Small Organizations: Adoption and Impact of Technology, MIS Quarterly, vol.19, issue.4, pp.465-485, 1995.
DOI : 10.2307/249629

S. L. Jarvenpaa and D. S. Staples, The use of collaborative electronic media for information sharing: an exploratory study of determinants, The Journal of Strategic Information Systems, vol.9, issue.2-3, pp.129-154, 2000.
DOI : 10.1016/S0963-8687(00)00042-1

B. Jones, J. Temperley, and A. Lima, Corporate reputation in the era of Web 2.0: the case of Primark, Journal of Marketing Management, vol.25, issue.9-10, pp.927-939, 2009.
DOI : 10.1362/026725709X479309

J. H. Kietzmann, K. Hermkens, I. P. Mccarthy, and B. S. Silvestre, Social media? Get serious! Understanding the functional building blocks of social media, Business Horizons, vol.54, issue.3, 2011.
DOI : 10.1016/j.bushor.2011.01.005

R. Kraut, R. Rice, C. Cool, and R. Fish, Varieties of Social Influence: The Role of Utility and Norms in the Success of a New Communication Medium, Organization Science, vol.9, issue.4, pp.437-453, 1998.
DOI : 10.1287/orsc.9.4.437

A. S. Lee, A scientific methodology for MIS case studies, MIS Quarterly, vol.131, pp.33-50, 1989.

S. S. Lim, S. Vadrevu, Y. H. Chan, and I. Basnyat, Facework on Facebook: The Online Publicness of Juvenile Delinquents and Youths-at-Risk, Journal of Broadcasting & Electronic Media, vol.8, issue.2, pp.3-2012
DOI : 10.1016/j.chb.2008.02.012

M. Limayem and S. G. Hirt, Force of habit and information systems usage: Theory and initial validation, Journal of the Association for Information Systems, vol.465, pp.97-97, 2003.

H. Lin, Interorganizational and organizational determinants of planning effectiveness for Internet-based interorganizational systems, Information & Management, vol.43, issue.4, pp.423-433, 2006.
DOI : 10.1016/j.im.2005.10.004

K. Lyytinen and J. Damsgaard, What???s Wrong with the Diffusion of Innovation Theory?, Proceedings of the IFIP TC8, pp.173-190, 2001.
DOI : 10.1007/978-0-387-35404-0_11

K. Lyytinen and J. Damsgaard, What???s Wrong with the Diffusion of Innovation Theory?, Diffusing Software Products and Process Innovations, pp.173-190, 2001.
DOI : 10.1007/978-0-387-35404-0_11

K. Lyytinen and J. Damsgaard, Inter-organizational information systems adoption ??? a configuration analysis approach, European Journal of Information Systems, vol.3, issue.3, 2011.
DOI : 10.1016/0963-8687(94)90027-2

A. Mahler, R. , and E. M. , The diffusion of interactive communication innovations and the critical mass: the adoption of telecommunications services by German banks, Telecommunications Policy, vol.23, issue.10-11, pp.10-11, 1999.
DOI : 10.1016/S0308-5961(99)00052-X

Y. Malhotra and D. F. Galletta, Extending the technology acceptance model to account for social influence: theoretical bases and empirical validation, Proceedings of the 32nd Annual Hawaii International Conference on Systems Sciences. 1999. HICSS-32. Abstracts and CD-ROM of Full Papers, p.14, 2002.
DOI : 10.1109/HICSS.1999.772658

M. L. Markus, Toward a ???Critical Mass??? Theory of Interactive Media, Communication Research, vol.14, issue.5, p.491, 1987.
DOI : 10.4135/9781483325385.n9

A. Marwick and N. B. Ellison, ???There Isn't Wifi in Heaven!??? Negotiating Visibility on Facebook Memorial Pages, Journal of Broadcasting & Electronic Media, vol.16, issue.12, pp.3-2012
DOI : 10.1177/0743558408328440

F. W. Mcfarlan, J. L. Mckenney, and P. Pyburn, The information archipelago--plotting a course, Harvard Business Review, vol.611, p.145

N. Melville and R. Ramirez, Information technology innovation diffusion: an information requirements paradigm, Information Systems Journal, vol.9, issue.3, pp.247-273, 2008.
DOI : 10.1111/j.1365-2575.2007.00260.x

URL : http://deepblue.lib.umich.edu/bitstream/2027.42/72203/1/j.1365-2575.2007.00260.x.pdf

G. C. Moore and I. Benhasat, Development of an Instrument to Measure the Perceptions of Adopting an Information Technology Innovation, Information Systems Research, vol.2, issue.3, pp.192-221, 1991.
DOI : 10.1287/isre.2.3.192

E. Mustonen-ollila and K. Lyytinen, Why organizations adopt information system process innovations: a longitudinal study using Diffusion of Innovation theory, Information Systems Journal, vol.34, issue.9, pp.275-297, 2003.
DOI : 10.1046/j.1365-2575.1997.d01-18.x

O. Reilly and T. , What is web 2.0," Design patterns and business models for the next generation of software (30), 2005.

M. Parameswaran and A. B. Whinston, Research issues in social computing, Journal of the Association for Information Systems, vol.8, issue.6, pp.336-350, 2007.

N. B. Peddibhotla and M. R. Subramani, Contributing to Public Document Repositories: A Critical Mass Theory Perspective, Organization Studies, vol.29, issue.5, p.327, 2007.
DOI : 10.1177/0170840607076002

G. Peng, Critical Mass, Diffusion Channels, and Digital Divide, Journal of Computer Information Systems, pp.63-71, 2010.

E. M. Rogers, Diffusion of innovations Free Press, 1995.

G. Salancik and J. Pfeffer, A Social Information Processing Approach to Job Attitudes and Task Design, Administrative Science Quarterly, vol.23, issue.2, pp.224-253, 1978.
DOI : 10.2307/2392563

S. Sarker and J. S. Valacich, Technology adoption by groups: A valence perspective, Journal of the Association for Information Systems, vol.6, issue.2, pp.37-71, 2005.

S. Sarker and J. Valacich, An Alternative to Methodological Individualism: A Non-Reductionist Approach to Studying Technoogy Adoption by Groups, MIS Quarterly, vol.34, issue.4, pp.779-808, 2010.

S. V. Scott and W. J. Orlikowski, Getting the truth': exploring the material grounds of institutional dynamics in social media, 2009.

D. Sledgianowski and S. Kulviwat, Using social network sites: the effects of playfulness, critical mass and trust in a hedonic context, Journal of Computer Information Systems, vol.49, pp.74-83, 2009.

D. Straub, M. Keil, and W. Brenner, Testing the technology acceptance model across cultures: A three country study, Information & Management, vol.33, issue.1, pp.1-11, 1997.
DOI : 10.1016/S0378-7206(97)00026-8

Z. Tufekci, GROOMING, GOSSIP, FACEBOOK AND MYSPACE, Information, Communication & Society, vol.11, issue.4, pp.544-564, 2008.
DOI : 10.1080/13691180801999050

S. A. Vannoy and P. Palvia, The social influence model of technology adoption, Communications of the ACM, vol.53, issue.6, pp.149-153, 2010.
DOI : 10.1145/1743546.1743585

V. Venkatesh, F. D. Davis, M. , and M. G. , Dead or alive? The development, trajectory and future of technology adoption research, Journal of the Association for Information Systems, vol.8, issue.4, pp.267-286, 2007.

V. Venkatesh, M. G. Morris, G. B. Davis, F. D. Davis, W. H. Delone et al., User acceptance of information technology: Toward a unified view, Information & Management, vol.27, issue.3, pp.425-478, 2003.